EP0525229B1 - Piston, especially for pushing out liquid metal from a pouring cylinder - Google Patents
Piston, especially for pushing out liquid metal from a pouring cylinder Download PDFInfo
- Publication number
- EP0525229B1 EP0525229B1 EP91112740A EP91112740A EP0525229B1 EP 0525229 B1 EP0525229 B1 EP 0525229B1 EP 91112740 A EP91112740 A EP 91112740A EP 91112740 A EP91112740 A EP 91112740A EP 0525229 B1 EP0525229 B1 EP 0525229B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- carrier
- sealing ring
- piston
- piston according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7005—Lugged member, rotary engagement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7005—Lugged member, rotary engagement
- Y10T403/7007—Bayonet joint
Definitions
- the invention relates to a piston of a die casting press for pressing liquid metal - preferably liquid aluminum or liquid brass - out of a casting cylinder, with a cap to be placed on a carrier and to be fastened to the carrier in this way, the cap having an inner cover surface of an end face of the carrier faces.
- Such a piston is known from EP-A2-423 413.
- the cap with an internal thread is to be thermally screwed onto an external thread of the carrier.
- the object of the invention is to facilitate the fitting and fastening of the cap to the carrier in order to enable the cap to be replaced quickly, so that the corresponding downtimes of the machine in which the piston works are reduced.
- the piston is characterized in that there are recesses in the inner circumferential surface of the cap in the vicinity of its free edge surface for receiving bayonet locking projections on the circumference of the carrier.
- the piston is preferably characterized in that there are four equally spaced bayonet-lock projections on the carrier, which four insertion recesses in the cap are assigned.
- the piston is preferably characterized in that the axial dimensions of the Recesses receiving bayonet catch protrusions, allowing an axial movement play between the inner cover surface of the cap and the end face of the wearer, are somewhat larger - preferably 0.1 to 0.2 mm larger - than the axial dimensions of the bayonet catch protrusions.
- the piston is preferably characterized in that, in order to fix the cap to the carrier, the cap has at least one round recess in its free edge for receiving a head part of a screw to be screwed into the carrier .
- the cap is preferably provided with a sealing ring in the front area of its circumference, as is known in principle from EP-A2-423 413. It has proven particularly useful in cooperation with the cap according to the invention that the sealing ring not only encompasses an outer circumferential web on the cap with an inner circumferential groove, but also that the sealing ring has a cylindrical inner circumferential surface in front of the circumferential groove, which has two axially successive, cylindrical outer circumferential surface sections of the Encloses the cap at a distance, wherein the front cylindrical outer peripheral surface has a larger diameter than the rear cylindrical outer peripheral surface.
- the rear cylindrical outer peripheral surface is designed as a retention puncture for solidified liquid metal. Metal that solidifies in the retaining groove spreads the sealing ring apart and thus increases its sealing effect.
- the sealing ring is held on the cap by the circumferential web.
- the front boundary surface of the peripheral web forms a stop surface for the sealing ring, so it absorbs an axial pressure on the sealing ring and delimits a sealing zone to the sealing ring.
- the cap preferably has a ring surface pointing forward at a short distance from a rear end face of the sealing ring.
- the cap In order to also use liquid metal that is penetrating axially over the outer circumferential surface of the sealing ring, the cap preferably has a section of reduced outer diameter behind the sealing ring that forms a storage zone. If metal enters this storage zone, the user recognizes that the sealing ring no longer has to be completely sealed and replaced.
- Fig. 1 shows an axial section, partly in side view, of a cap located on a carrier, the carrier being pushed forward relative to the cap.
- Fig. 2 shows corresponding to Fig. 1 the case that the carrier is pulled back relative to the cap.
- Fig. 3 shows a section along III-III in Fig. 1 with the cap not yet locked.
- Fig. 4 shows corresponding to Fig. 3, the locked cap.
- Fig. 5 shows an exploded view of the cap and carrier.
- the piston according to the exemplary embodiment has an end to be secured to a carrier 2 and serves as the actual piston Cap 4 on.
- the cap 4 faces an end face 8 of the carrier 2 with an inner cover surface 6.
- In the inner circumferential surface 10 of the cap 4 there are four depressions 14 in the vicinity of their free edge surface 12, which have the same angular spacing from one another, for receiving four bayonet catches 16 on the circumference 18 of the carrier 2, respectively.
- the axial dimensions of the bayonet catch projections 16 Recesses 14 - allowing an axial play of movement between the inner cover surface 6 of the cap 4 and the end face 8 of the carrier 2, as can be seen in FIGS. 1 and 2, permitting temperature expansion of the cap 4 - are somewhat larger than the axial dimensions of the bayonet lock projections 16.
- the cap 4 has in its free edge surface 12 a round recess 20 for receiving a head part 22 of a screw 24 to be screwed into the carrier 2.
- the carrier 2 is provided with an internal thread 26 for screwing onto an external thread of a piston rod, not shown.
- an internal thread 26 for screwing onto an external thread of a piston rod, not shown.
- attachment surfaces 28 for a U key on the outside of the carrier are provided.
- the piston rod and the carrier 2 are axially penetrated by a tube 30 which ends in a bore 32 in front of the end face 8 of the carrier 2.
- a coolant can be pressed through the tube 30 into a radial cannula 34 in the end face 8 of the carrier, which coolant can then be drawn through axial recesses 36 in a front annular support surface 38 of the carrier via an annular channel 40 and obliquely extending bores 42 in a carrier 2 formed in the carrier 2. the tube surrounding the annular space 44 and from there flows back through the carrier 2. Details of this type of cooling are described in EP-A2-423 413.
- a sealing ring 46 is schematically shown, which encloses the front end of the cap 4.
- cap and sealing ring which can also be used independently of the cap 4 which can be plugged onto the carrier 2 by means of a bayonet lock and which is explained in connection with FIGS. 1 to 5, is shown in FIG. 6.
- Another preferred embodiment has a cap which has a cylindrical projection with an outer ring web on an outer cover surface. This ring web engages in an inner ring groove of a sealing ring.
- the cylindrical extension is provided with an annular recess, which serves to receive an inner annular web of the sealing ring.
- the sealing ring and the shoulder have at the front first parallel, then diverging to the front, opposing boundary surfaces.
- a ring shoulder of the outer cover surface of the cap which is radially delimited by the extension, is opposite a rear boundary surface of the sealing ring at a short distance.
- the rear boundary surface of the sealing ring merges into the outer peripheral surface of the sealing ring via a run-up slope.
- the sealing ring In front of the annular groove, the sealing ring has a cylindrical inner circumferential surface which forms a section of the boundary surface and encloses two axially successive cylindrical outer circumferential sections of the cap at a distance, the front cylindrical outer circumferential section having a larger diameter than the rear cylindrical outer circumferential section.
- the outer peripheral portion thus limits the Retention puncture described at the beginning.
- the cap has a section of reduced outer diameter which forms the storage zone described at the outset.
- the liquid metal flows into the spaces between the sealing ring and the cap and in the axial direction over the outer peripheral surface of the sealing ring.
- the piston is to be moved within an inner circumferential surface of a casting cylinder.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Sealing Devices (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
Die Erfindung betrifft einen Kolben einer Druckgußpresse zum Herausdrücken von flüssigem Metall - vorzugsweise flüssigem Aluminium oder flüssigem Messing - aus einem Gießzylinder, mit einer auf einen Träger aufzusetzenden und an dem Träger derart zu befestigenden Kappe, wobei die Kappe mit einer inneren Deckfläche einer Stirnfläche des Trägers gegenübersteht.The invention relates to a piston of a die casting press for pressing liquid metal - preferably liquid aluminum or liquid brass - out of a casting cylinder, with a cap to be placed on a carrier and to be fastened to the carrier in this way, the cap having an inner cover surface of an end face of the carrier faces.
Ein solcher Kolben ist nach der EP-A2-423 413 bekannt. Dort ist die Kappe mit einem Innengewinde thermisch auf ein Außengewinde des Trägers aufzuschrauben.Such a piston is known from EP-A2-423 413. There the cap with an internal thread is to be thermally screwed onto an external thread of the carrier.
Aufgabe der Erfindung ist es, das Aufsetzen und Befestigen der Kappe an dem Träger zu erleichtern, um ein rasches Auswechseln der Kappe zu ermöglichen, so daß die entsprechenden Stillstandszeiten der Maschine, in der der Kolben arbeitet, verringert werden.The object of the invention is to facilitate the fitting and fastening of the cap to the carrier in order to enable the cap to be replaced quickly, so that the corresponding downtimes of the machine in which the piston works are reduced.
Zur Lösung dieser Aufgabe ist der Kolben dadurch gekennzeichnet, daß sich in der Innenumfangsfläche der Kappe in der Nähe ihrer freien Randfläche Vertiefungen zur Aufnahme von Bajonettverschluß-Vorsprüngen am Umfang des Trägers befinden.To achieve this object, the piston is characterized in that there are recesses in the inner circumferential surface of the cap in the vicinity of its free edge surface for receiving bayonet locking projections on the circumference of the carrier.
Um die Kappe nach nur 1/8 Drehung in bezug zum Träger von dem Träger lösen zu können oder an dem Träger befestigen zu können, ist der Kolben bevorzugt dadurch gekennzeichnet, daß sich an dem Träger vier gleiche Winkelabstände voneinander aufweisende Bajonettverschluß-Vorsprünge befinden, denen vier Einsteck-Ausnehmungen in der Kappe zugeordnet sind.In order to be able to detach the cap from the carrier or to fasten it to the carrier after only 1/8 rotation with respect to the carrier, the piston is preferably characterized in that there are four equally spaced bayonet-lock projections on the carrier, which four insertion recesses in the cap are assigned.
Um eine Art Pumpkühlung der Kappe zu erhalten, wobei ein Kühlkreislauf vorgesehen sein kann, wie er in der EP-A2-423 413 beschrieben ist, ist der Kolben bevorzugt dadurch gekennzeichnet, daß die axialen Abmessungen der die Bajonettverschluß-Vorsprünge aufnehmenden Vertiefungen, ein axiales Bewegungsspiel zwischen der inneren Deckfläche der Kappe und der Stirnfläche des Trägers gestattend, etwas größer - vorzugsweise um 0,1 bis 0,2 mm größer - als die axialen Abmessungen der Bajonettverschluß-Vorsprünge sind.In order to obtain a kind of pump cooling of the cap, wherein a cooling circuit can be provided, as described in EP-A2-423 413, the piston is preferably characterized in that the axial dimensions of the Recesses receiving bayonet catch protrusions, allowing an axial movement play between the inner cover surface of the cap and the end face of the wearer, are somewhat larger - preferably 0.1 to 0.2 mm larger - than the axial dimensions of the bayonet catch protrusions.
Um die Kappe an dem Träger in einfacher Weise sichern zu können, ist der Kolben bevorzugt dadurch gekennzeichnet, daß zur Festlegung der Kappe an dem Träger die Kappe in ihrem freien Rand wenigstens eine runde Ausnehmung zur Aufnahme eines Kopfteils einer in den Träger zu schraubenden Schraube aufweist.In order to be able to secure the cap to the carrier in a simple manner, the piston is preferably characterized in that, in order to fix the cap to the carrier, the cap has at least one round recess in its free edge for receiving a head part of a screw to be screwed into the carrier .
Die Kappe ist im vorderen Bereich seines Umfangs bevorzugt mit einem Dichtungsring versehen, wie dies grundsätzlich nach der EP-A2-423 413 bekannt ist. Besonders bewährt hat sich in Zusammenwirken mit der erfindungsgemäßen Kappe, daß der Dichtungsring nicht nur mit einer inneren Umfangsnut einen äußeren Umfangssteg an der Kappe umgreift, sondern daß überdies der Dichtungsring vor der Umfangsnut eine zylindrische Innenumfangsfläche aufweist, die zwei axial aufeinander folgende, zylindrische Außenumfangsflächenabschnitte der Kappe mit Abstand umschließt, wobei die vordere zylindrische Außenumfangsfläche einen größeren Durchmesser hat als die hintere zylindrische Außenumfangsfläche.The cap is preferably provided with a sealing ring in the front area of its circumference, as is known in principle from EP-A2-423 413. It has proven particularly useful in cooperation with the cap according to the invention that the sealing ring not only encompasses an outer circumferential web on the cap with an inner circumferential groove, but also that the sealing ring has a cylindrical inner circumferential surface in front of the circumferential groove, which has two axially successive, cylindrical outer circumferential surface sections of the Encloses the cap at a distance, wherein the front cylindrical outer peripheral surface has a larger diameter than the rear cylindrical outer peripheral surface.
Die hintere zylindrische Außenumfangsfläche ist dabei als ein Rückhalteeinstich für erstarrtes flüssiges Metall ausgebildet. In dem Rückhalteeinstich erstarrtes Metall spreizt den Dichtungsring auseinander und erhöht somit seine Dichtwirkung.The rear cylindrical outer peripheral surface is designed as a retention puncture for solidified liquid metal. Metal that solidifies in the retaining groove spreads the sealing ring apart and thus increases its sealing effect.
Der Dichtungsring wird durch den Umfangssteg an der Kappe festgehalten. Die vordere Begrenzungsfläche des Umfangsstegs bildet dabei eine Anschlagfläche für den Dichtungsring, nimmt also einen axial auf den Dichtungsring wirkenden Druck auf und begrenzt eine Dichtzone zum Dichtungsring. Dementsprechend weist die Kappe bevorzugt in geringem Abstand von einer hinteren Stirnfläche des Dichtungsrings eine nach vorne weisende Ringfläche auf.The sealing ring is held on the cap by the circumferential web. The front boundary surface of the peripheral web forms a stop surface for the sealing ring, so it absorbs an axial pressure on the sealing ring and delimits a sealing zone to the sealing ring. Accordingly, the cap preferably has a ring surface pointing forward at a short distance from a rear end face of the sealing ring.
Um auch axial über die Außenumfangsfläche des Dichtungsrings dringendes flüssiges Metall zur Dichtung auszunutzen, weist bevorzugt die Kappe hinter dem Dichtungsring einen eine Speicherzone bildenden Abschnitt verringerten Außendurchmessers auf. Tritt in diese Speicherzone Metall ein, so erkennt der Benutzer, daß der Dichtungsring nicht mehr vollständig abdichtet und ausgewechselt werden muß.In order to also use liquid metal that is penetrating axially over the outer circumferential surface of the sealing ring, the cap preferably has a section of reduced outer diameter behind the sealing ring that forms a storage zone. If metal enters this storage zone, the user recognizes that the sealing ring no longer has to be completely sealed and replaced.
Die Erfindung wird im folgenden an Ausführungsbeispielen unter Hinweis auf die beigefügten Zeichnungen erläutert.The invention is explained below using exemplary embodiments with reference to the accompanying drawings.
Fig. 1 zeigt im Achsschnitt teilweise in Seitenansicht eine auf einem Träger befindliche Kappe, wobei der Träger relativ zur Kappe nach vorne geschoben ist.Fig. 1 shows an axial section, partly in side view, of a cap located on a carrier, the carrier being pushed forward relative to the cap.
Fig. 2 zeigt entsprechend Fig. 1 den Fall, daß der Träger relativ zur Kappe nach hinten gezogen ist.Fig. 2 shows corresponding to Fig. 1 the case that the carrier is pulled back relative to the cap.
Fig. 3 zeigt einen Schnitt längs III-III in Fig. 1 bei noch nicht verriegelter Kappe.Fig. 3 shows a section along III-III in Fig. 1 with the cap not yet locked.
Fig. 4 zeigt entsprechend Fig. 3 die verriegelte Kappe.Fig. 4 shows corresponding to Fig. 3, the locked cap.
Fig. 5 zeigt eine Explosionsdarstellung von Kappe und Träger.Fig. 5 shows an exploded view of the cap and carrier.
Der Kolben nach dem Ausführungsbeispiel weist eine an einen Träger 2 zu sichernde, als eigentlicher Kolben dienende Kappe 4 auf. Die Kappe 4 steht mit einer inneren Deckfläche 6 einer Stirnfläche 8 des Trägers 2 gegenüber. In der Innenumfangsfläche 10 der Kappe 4 befinden sich in der Nähe ihrer freien Randfläche 12 vier Vertiefungen 14, die gleiche Winkelabstände voneinander haben, zur Aufnahme von entsprechend vier Bajonettverschlüssen 16 am Umfang 18 des Trägers 2. Die axialen Abmessungen der die Bajonettverschluß-Vorsprünge 16 aufnehmenden Vertiefungen 14 sind - ein aus Fig. 1 und 2 ersichtliches axiales, Temperaturdehnungen der Kappe 4 zulassendes Bewegungsspiel zwischen der inneren Deckfläche 6 der Kappe 4 und der Stirnfläche 8 des Trägers 2 gestattend - etwas größer als die axialen Abmessungen der Bajonettverschluß-Vorsprünge 16.The piston according to the exemplary embodiment has an end to be secured to a
Zur Festlegung der Kappe 4 an dem Träger 2 weist die Kappe 4 in ihrer freien Randfläche 12 eine runde Ausnehmung 20 zur Aufnahme eines Kopfteils 22 einer in den Träger 2 zu schraubenden Schraube 24 auf.To fix the
Der Träger 2 ist mit einem Innengewinde 26 zum Aufschrauben auf ein Außengewinde einer nicht dargestellten Kolbenstange versehen. Zum Zwecke des Aufschraubens befinden sich auf der Außenseite des Trägers Ansatzflächen 28 für einen U-Schlüssel.The
Die Kolbenstange und der Träger 2 sind axial von einem Rohr 30 durchsetzt, das in einer Bohrung 32 vor der Stirnfläche 8 des Trägers 2 endet. Durch das Rohr 30 kann ein Kühlmittel in eine Radialkanüle 34 in der Stirnfläche 8 des Trägers gedrückt werden, das dann durch axiale Ausnehmungen 36 in einer vorderen ringförmigen Stützfläche 38 des Trägers über einen Ringkanal 40 und schräg verlaufende Bohrungen 42 in einen im Träger 2 ausgebildeten, das Rohr umschließenden Ringraum 44 und von dort durch den Träger 2 wieder zurückströmt. Einzelheiten dieser Art von Kühlung sind in der EP-A2-423 413 beschrieben.The piston rod and the
In den Fig. 1, 2 und 5 ist schematisch ein Dichtungsring 46 dargestellt, der das vordere Ende der Kappe 4 umschließt.1, 2 and 5, a
Eine besonders bevorzugte Ausführungsform von Kappe und Dichtungsring, die auch unabhängig von der in Zusammenhang mit Fig. 1 bis 5 erläuterten, durch einen Bajonettverschluß auf den Träger 2 aufsteckbaren Kappe 4 verwendet werden kann, ist in Fig. 6 dargestellt.A particularly preferred embodiment of the cap and sealing ring, which can also be used independently of the
Eine andere bevorzugte Ausführungsform hat eine Kappe, die auf einer äußeren Deckfläche einen zylindrischen Ansatz mit einem äußeren Ringsteg aufweist. Dieser Ringsteg greift in eine innere Ringnut eines Dichtungsrings ein. Der zylindrische Ansatz ist mit einer Ringausnehmung versehen, die der Aufnahme eines inneren Ringstegs des Dichtungsrings dient.Another preferred embodiment has a cap which has a cylindrical projection with an outer ring web on an outer cover surface. This ring web engages in an inner ring groove of a sealing ring. The cylindrical extension is provided with an annular recess, which serves to receive an inner annular web of the sealing ring.
Der Dichtungsring und der Ansatz weisen frontseitig zunächst parallele, dann nach vorne auseinanderstrebende, einander gegenüberstehende Begrenzungsflächen auf. Einer durch den Ansatz radial begrenzten Ringschulter der äußeren Deckfläche der Kappe steht mit geringem Abstand eine rückwärtige Begrenzungsfläche des Dichtungsrings gegenüber. Die rückwärtige Begrenzungsfläche des Dichtungsrings geht in die äußere Umfangsfläche des Dichtungsrings über eine Auflaufschräge über.The sealing ring and the shoulder have at the front first parallel, then diverging to the front, opposing boundary surfaces. A ring shoulder of the outer cover surface of the cap, which is radially delimited by the extension, is opposite a rear boundary surface of the sealing ring at a short distance. The rear boundary surface of the sealing ring merges into the outer peripheral surface of the sealing ring via a run-up slope.
Vor der Ringnut weist der Dichtungsring eine zylindrische Innenumfangsfläche auf, die einen Abschnitt der Begrenzungsfläche bildet und zwei axial aufeinanderfolgende zylindrische Außenumfangsabschnitte der Kappe mit Abstand umschließt, wobei der vordere zylindrische Außenumfangsabschnitt einen größeren Durchmesser hat als der hintere zylindrischen Außenumfangsabschnitt. Der Außenumfangsabschnitt begrenzt somit den eingangs beschriebenen Rückhalte-Einstich.In front of the annular groove, the sealing ring has a cylindrical inner circumferential surface which forms a section of the boundary surface and encloses two axially successive cylindrical outer circumferential sections of the cap at a distance, the front cylindrical outer circumferential section having a larger diameter than the rear cylindrical outer circumferential section. The outer peripheral portion thus limits the Retention puncture described at the beginning.
Hinter dem Dichtungsring weist die Kappe einen die eingangs beschriebene Speicherzone bildenden Abschnitt verringerten Außendurchmessers auf.Behind the sealing ring, the cap has a section of reduced outer diameter which forms the storage zone described at the outset.
Das flüssige Metall strömt in die Räume zwischen dem Dichtungsring und der Kappe und in Axialrichtung über die äußere Umfangsfläche des Dichtungsrings. Der Kolben ist innerhalb einer Innenumfangsfläche eines Gießzylinders zu verschieben.The liquid metal flows into the spaces between the sealing ring and the cap and in the axial direction over the outer peripheral surface of the sealing ring. The piston is to be moved within an inner circumferential surface of a casting cylinder.
Claims (7)
- Piston of a die casting press for pushing out liquid metal - preferably liquid aluminium or liquid brass - from a pouring cylinder with a cap (4) which fits onto a carrier (2) and is secured to the carrier (2), in that the cap (4) with an inner lid surface (6) lies opposite an end face (8) of the carrier (2),
characterised in that there are recesses (14) in the inner peripheral surface (10) of the cap (4) in the vicinity of its free edge surface (12) for mounting bayonet projections (16) on the periphery (18) of the carrier (2). - Piston according to Claim 1, characterised in that on the carrier (2) there are four bayonet projections (16) spaced at equal angular distances from one another to which four insertion recesses (15) are allocated in the cap (4).
- Piston according to Claim 1 or 2, characterised in that the axial dimensions of the recesses (14) accommodating the bayonet sealing projections (16), permitting axial play between the inner lid surface (6) of the cap (4) and the end face (8) of the carrier (2), are slightly larger - preferably 0.1 to 0.2 mm larger - than the axial dimensions of the bayonet projections (16).
- Piston according to one of the preceding claims, characterised in that to secure the cap (4) onto the carrier (2) the cap (4) at its free edge surface (12) has at least one round recess (20) for mounting a head (22) of a screw (24) to be screwed into the carrier (2).
- Piston, in which the cap is provided in a front peripheral section with a sealing ring which surrounds with an inner annular groove an outer annular link on the cap, according to one of the preceding claims, characterised in that the sealing ring in front of the annular groove has a cylindrical inner peripheral surface which surrounds two axially consecutive, cylindrical outer peripheral sections of the cap at a distance, whereby the front cylindrical outer peripheral section has a larger diameter than the rear cylindrical outer peripheral section.
- Piston according to claim 5, characterised in that the cap at a small distance from a rear delimiting surface of the sealing ring comprises a forwards pointing annular shoulder.
- Piston according to claim 5 or 6, characterised in that cap behind the sealing ring comprises a section forming a storage zone of smaller outer diameter.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP91112740A EP0525229B1 (en) | 1991-07-29 | 1991-07-29 | Piston, especially for pushing out liquid metal from a pouring cylinder |
| ES91112740T ES2095886T3 (en) | 1991-07-29 | 1991-07-29 | PISTON, PARTICULARLY TO PUSH LIQUID METAL OUT OF A CAST CYLINDER. |
| DE59108332T DE59108332D1 (en) | 1991-07-29 | 1991-07-29 | Piston, in particular for pushing liquid metal out of a casting cylinder |
| US07/919,258 US5233912A (en) | 1991-07-29 | 1992-07-27 | Piston for forcing liquid metal out of a casting cylinder |
| JP22189892A JP3300045B2 (en) | 1991-07-29 | 1992-07-28 | Piston and seal ring for piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP91112740A EP0525229B1 (en) | 1991-07-29 | 1991-07-29 | Piston, especially for pushing out liquid metal from a pouring cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0525229A1 EP0525229A1 (en) | 1993-02-03 |
| EP0525229B1 true EP0525229B1 (en) | 1996-11-06 |
Family
ID=8206992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91112740A Expired - Lifetime EP0525229B1 (en) | 1991-07-29 | 1991-07-29 | Piston, especially for pushing out liquid metal from a pouring cylinder |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5233912A (en) |
| EP (1) | EP0525229B1 (en) |
| JP (1) | JP3300045B2 (en) |
| DE (1) | DE59108332D1 (en) |
| ES (1) | ES2095886T3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4230080C2 (en) * | 1992-09-09 | 1998-04-09 | Hugo Kunz | Die casting pistons, in particular for cold chamber die casting machines |
| US5411350A (en) * | 1993-11-03 | 1995-05-02 | Loctite Corporation | Quick connect/disconnect device, and dispensing apparatus comprising same |
| JP3019713B2 (en) * | 1994-02-21 | 2000-03-13 | 豊田合成株式会社 | Operation knob assembly structure |
| US5653322A (en) * | 1996-01-30 | 1997-08-05 | Borg-Warner Automotive, Inc. | Two piece clutch assembly having twist lock joint |
| US5607251A (en) * | 1996-04-03 | 1997-03-04 | The Stanley Works | Quick coupler assembly for hanging attachment |
| US5687604A (en) * | 1996-05-30 | 1997-11-18 | Exco Technologies Ltd. | Thermal controlled mandrel with replaceable tip for copper and brass extrusion |
| US5680894A (en) * | 1996-10-23 | 1997-10-28 | Lindberg Corporation | Apparatus for the injection molding of a metal alloy: sub-ring concept |
| US5913605A (en) * | 1997-09-17 | 1999-06-22 | G. H. Hensley Industries, Inc. | Rotary lock system for wear runner assembly |
| DE19923341B4 (en) * | 1999-05-21 | 2005-03-03 | Audi Ag | Method for operating a die casting machine and die casting machine for carrying out the method |
| DE10037887A1 (en) * | 2000-08-03 | 2002-02-14 | Mahle Gmbh | Piston-cylinder assembly for an internal combustion engine with a shaftless piston |
| US6598450B2 (en) | 2001-11-02 | 2003-07-29 | Sequa Can Machinery, Inc. | Internally cooled punch |
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| US8550743B2 (en) * | 2005-09-30 | 2013-10-08 | Medtronic, Inc. | Sliding lock device |
| DE102005048717A1 (en) * | 2005-10-12 | 2007-04-19 | Allper Ag | Multi-part piston for a cold chamber casting machine |
| ITBS20060087A1 (en) * | 2006-04-12 | 2007-10-13 | Copromec S R L | PISTON FOR COLD ROOM DIE CASTING MACHINES |
| US8048069B2 (en) | 2006-09-29 | 2011-11-01 | Medtronic, Inc. | User interface for ablation therapy |
| US20080286398A1 (en) * | 2007-05-15 | 2008-11-20 | Jui-Hsiang Wang | Fast-to-install structure for a threaded rod of an injection molding machine |
| IT1393330B1 (en) * | 2009-01-21 | 2012-04-20 | Brondolin S P A | PISTONS FOR DIE CASTING |
| IT1393329B1 (en) * | 2009-01-21 | 2012-04-20 | Brondolin S P A | PISTON AND SEALING RING FOR DIE CASTING |
| DE102009056903A1 (en) * | 2009-12-03 | 2011-06-09 | Danfoss A/S | Hydraulic piston machine, in particular water-hydraulic machine |
| DE202010008596U1 (en) | 2010-09-21 | 2010-12-02 | Schmelzmetall (Deutschland) Gmbh | Die-cast pistons |
| FR2974023A1 (en) * | 2011-04-14 | 2012-10-19 | Sidel Participations | DEVICE FOR ASSEMBLING A TOOLING ON A SUPPORT |
| DE102011052446A1 (en) | 2011-08-05 | 2013-02-07 | Schmelzmetall Ag | Die-cast piston head |
| MX350918B (en) * | 2012-04-20 | 2017-09-25 | Cpr Suisse S A | Piston for cold chamber die-casting machines. |
| ES2449165B1 (en) * | 2014-02-21 | 2014-09-02 | Alrotec Tecnology S.L.U. | Piston for cold chamber injection machines |
| EP3562607B1 (en) * | 2016-12-30 | 2021-04-07 | Exco Technologies Limited | Die-casting piston, and die-casting apparatus incorporating same |
| US10807286B2 (en) * | 2017-04-06 | 2020-10-20 | Mold-Masters (2007) Limited | Liquid injection molding apparatus |
| DE102017003693B3 (en) * | 2017-04-15 | 2018-06-14 | Wieland-Werke Ag | Die-casting piston |
| US10987731B1 (en) * | 2020-07-30 | 2021-04-27 | Exco Technologies Limited | Die-casting piston, and die-casting apparatus incorporating same |
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| US2862738A (en) * | 1954-10-27 | 1958-12-02 | Charles A D Bayley | Subaqueous structures for supporting a working platform above water |
| US2844424A (en) * | 1956-02-20 | 1958-07-22 | Rand Goetze Corp | Piston sealing means |
| US2844422A (en) * | 1956-12-05 | 1958-07-22 | Rand Goetze Corp | Piston ring |
| DE1029615B (en) * | 1957-02-14 | 1958-05-08 | Krauss Maffei Ag | Piston ring |
| US2901258A (en) * | 1957-09-30 | 1959-08-25 | Brandafi Gabriel | Drill press spindle |
| SE7510628L (en) * | 1974-09-28 | 1976-03-29 | Hugo Kunz | PRESSURE PISTON FOR A PRESSURE MOLDING MACHINE |
| DE2446503A1 (en) * | 1974-09-28 | 1976-04-15 | Hugo Kunz | Injection plungers for pressure die-casting machines - using beryllium-copper sleeve on steel core |
| DE8304487U1 (en) * | 1983-02-18 | 1985-05-02 | Glas, Friedrich, 8192 Geretsried | Pistons for die casting machines |
| US4529330A (en) * | 1983-06-30 | 1985-07-16 | Otis Engineering Corporation | Cylinder connection |
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| ES2102354T3 (en) * | 1989-10-18 | 1997-08-01 | Allper Ag | PISTON, FOR A LOW PRESSURE CASTING DEVICE. |
| DE9014003U1 (en) * | 1990-10-08 | 1990-12-13 | Alfred Kunz GmbH & Co, 8000 München | Contact profile, especially for shielded doors with door frames for shielded rooms |
| DE9014033U1 (en) * | 1990-10-09 | 1990-12-13 | D. Schade GmbH, 2356 Aukrug | Pistons for die casting machines |
-
1991
- 1991-07-29 EP EP91112740A patent/EP0525229B1/en not_active Expired - Lifetime
- 1991-07-29 ES ES91112740T patent/ES2095886T3/en not_active Expired - Lifetime
- 1991-07-29 DE DE59108332T patent/DE59108332D1/en not_active Expired - Fee Related
-
1992
- 1992-07-27 US US07/919,258 patent/US5233912A/en not_active Expired - Lifetime
- 1992-07-28 JP JP22189892A patent/JP3300045B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3300045B2 (en) | 2002-07-08 |
| JPH0617931A (en) | 1994-01-25 |
| EP0525229A1 (en) | 1993-02-03 |
| US5233912A (en) | 1993-08-10 |
| ES2095886T3 (en) | 1997-03-01 |
| DE59108332D1 (en) | 1996-12-12 |
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